I installed this Bauer door lock on my Challenger GT. It fit perfectly. The only downside is you have to change batteries occasionally. I they go dead, you would be locked out of the motor home unless you have your key with you. I am a little paranoid about it so I carry a key with me anytime I lock up, even going to the campground showers.
https://www.rvupgradestore.com/Bauer...0342491BB56019